The WG has deliberated at length wrt multiple inheritance, which many
members agree with you would be useful. We reached consensus that it
was too complex for v.1.
Your approach of using one type hierarchy and mixins for the other
ancestors via attribute and model groups is the best you can do for
now.
ht
--
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
W3C Fellow 1999--2001, part-time member of W3C Team
2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
URL: http://www.ltg.ed.ac.uk/~ht/